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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9337677bf5473616011d577566874a2184ac3ea7a7c1dbf1605154a174c588c' 
  AND token = 'Dpl5BFwVx+knItV8K24zngfOD5kSQjqQv4a70PAVXiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}